Air conditioning system



July 21, 1942.

' AIR CONDITIONING SYSTEM s. s. LAWLER 2,290,757

Filed Aug. 11, 1938 2 Sheets-Sheet 2 CLOSED DURING DAY CLOSED DURING PICK-UP I89 [86 we 35"QQ99D5 L 0 223 228 ---9&m1

Smaentor 5mm rule]! 5. Lmwler djtorneg Patented July 21,- 1942 AIR CONDITIONING SYSTEM Samuel S. Lawlei-{Minneapolia Minn, assignor to Minneapolis-Honeywell Regulator Company, Minneapolis, Minn.,' a corporation of Delaware Application August 11, 1938, Serial No. 224,413

1': Claims.

The present invention is related to an air conditioning system and more particularly to one in which there is a shut-down period during certain portions of the day.

It is the usual practice in air conditioning systems for a residence, particularly in the case of heating systems, to provide for a night shut-- down period. In the case of a heating system,

considerable saving in fuel may be effected by reducing the temperature maintained at night. Furthermore, it is quite'common to open the windows of those rooms used for sleeping purposes and it obviously is undesirable for any appreciable amount of heat to be conducted to the rooms while the windows are thus open. In order to conserve heat, it is quite customary in the case of a warm'air heating system, for the occupant of the room opening the window to also close the register. Sometimes this is not done, however, with the result that considerable heat is wasted through the open window.. The opening of the windows further introduces a serious problem during the "pick-up period in the morning. While the temperature may have been reduced in the'downstairs portion or the portion of the house normally occupied during the day,

the temperature therein will normally still beconsiderable higher than the temperature of these rooms used for sleeping in which the windows have been open all night. Accordingly, when it is attempted to restore the temperature to normal in both the normally occupied and the sleeping zones, either an excessively long time is required for such restoration of the'temperaiture or the heat must be delivered to both zones at such an excessive rate that the temperature in the normally occupied zone becomes excessively high.

An object of the present invention is to provide an air conditioning system for a plurality of zones wherein the proportionate amount of air delivered to one zone is decreased below normal for a predetermined period and at the end of the period is temporarily increased above normal.

A further object of the invention is to' provide such a system in which the temporary increase in the proportion of air to .one zone is maintained until the condition in said zone attains a predetermined value.

A further object of the invention is to provide such a system in which the temporary increase in the proportion of air to one zone is maintained for a second predetermined period of time.

A still further object of the invention is to provide a warm air heating system for a residence having a sleeping zone and a living zone with means for reducing the temperature in both zones and reducing the proportionate amount of air delivered to the sleeping zone at night and for increasing the proportionate amount of air delivered to the sleeping zone when it is desired to restore the zone temperature to normal.

Other objects of the invention will be apparent from a consideration of the accompanying speci- V in turn, is connected to a gas supply pipe l3 leading from any suitable commercial source of gas (not shown). The .valve I2 is shown as being of the motorized type which upon energization' thereof is moved to open position and upon deenergization thereofv is moved to closed, position by some biasing means. I

Extending from the furnace I0 is a warm air delivery duct l5. This duct is divided into two branch ducts l8 and H, the branch duct l6 leading to a register I8 which is located in an upstairs or sleeping zone I9. The duct l1 leads to a-register 2| which is located in the downstairs zone 22 or one normally occupied during the day. While only one register has been shown for each zone, it is to be understood that each zone may consist of a number of rooms and branch ducts may lead from the pipes l6 and I! to thesevarious zones with an individual damper at each register for opening and closing the zone in the normal manner. The proportionate amount of air delivered to pipes I6 and I1 is controlled by a splitter damper 25. This damper is pivoted at 26 and has an arm 21 secured thereto for actuating the same. The outer end of arm 21 has secured thereto a spring 28 which, in turn, is

secured to a fixed support 29. The spring 28' serves to bias the arm upwardly. The function of the splitter damper is to proportion the air between the two ducts l6 and i1 and it is to be understood that any further branch ducts leading to individual rooms are connected to pipes I6 and I1 beyond the splitter damper 25.

Cold air registers 38 and 3| are provided in zones I8 and 22, respectively. The cold air register 88 communicates with a return air duct 33 and register 3| with a duct 34. The two ducts 33 and 34 lead to a common return air duct 35 which returns to the furnace in the conventionalmanner (not shown). A damper 48 is provided in the duct 33. This damper 48 is pivoted at 4| and has an arm 42 secured thereto for operating the same. Secured to arm 42 is a spring 43 which is secured to a fixed support 44. The spring 43 serves to bias the arm 42 to the right, or in other words, to bias the damper 48 to the dotted line position wherein the damper is closed.

A damper motor 58 is provided for positioning the splitter damper 25 and the return air duct damper 48. This damper motor 58 is of the 'proportioning type shown in the patent to D. G.

Taylor, No. 2,028,110, issued January 14, 1936. The motor of this patent is adapted to be controlled by a three-wire potentiometer. When the potentiometer is in its mid position, the motor is driven to a mid position through the action of a balancing resistance associated with the motor. Upon the control potentiometer moving to a short circuit position at either end, the motor is driven to the corresponding end of its movement and such movement is terminated by a. limit switch. Where a potentiometer is used, the motor may assume any desired intermediate position. Inasmuch as only three positions are desired for the present application, a control pothe engagement of the cam follower 18 with the cam 58 is at point 13. When cam follower I8 engages the cam at point 1|, it assumes the full line position thereof. When cam follower 18 en-' gages the cam at point 12, the cam follower I8.

assumes the upper dotted line position. When the engagement is at point I3, the follower I8 assumes the lower dotted line position. A chain serves to connect the follower arm 18 with the arm 21 of the splitter damper 25, the chain passing over rollers 18. When the motor is in the extreme position shown, the splitter damper '25 occupies its normal intermediate position.

When the damper motor is in the other extreme position so that the cam follower arm 18 is in its lowermost dotted line position, the splitter damper 25 assumes the left dotted line position.

When the cam follower I8 is in the upper dotted line position, the splitter damper 25 assumes the right dotted line position.

The relay 55 comprises a, relay coil 88 which cooperates with a pair of switch blades 81 and 88. The switch blades 81 and 88 are biased to the left, switch blade 88 being biased into .engagement with a contact 88. Upon energization of relay coil 88, switch arms 81 and 88 are moved to the right into engagement with contacts 88 tentiometer is not used. The motor is provided with three terminals 5|, 52, and 53. When terminal 5| is connected to neither terminal 52 or 53, the motor runs to the mid position under the control of the rebalancing potentiometer I therein. when terminal 5Iis connected to either terminal 52 or 53, the motor runs to one or the other of its extreme positions. .The. connection of terminal 5| to terminals 52 and 53 is controlled by a pair. of relays 55 and 58 in a manner to be subsequently explained.

The motor 58 is provided with a shaft 51 on which is mounted a pair of cams 58 and 58. Cam

58 cooperates with a cam follower in the form of a lever 88. The'cam is provided with two high points 8| and 82 and a low point 83. The motor 58 is designed to travel 180 and atone end of the motor travel the cam follower 88 is in engagement with the cam at 8| as shown, and at the other end with point 82. When cam follower 88 is inengagement with the cam at either point 8! or 82, it is in its full line position. In

the intermediate position of the motor, the cam follower 88 engages the cam at point 83 and assumes the dotted line position shown on the drawings. The cam follower 88 is connected by means of a chain 85 or similar device to the arm 42 of the return air duct damper 48, the chain 85 extending over rollers 88. In the full line position of the cam follower, the return air duct damper 48 is in its open position. In the dotted line position of the cam follower,.th'e return airduct damper 48 is in its closed position.

The cam 58, which as previously, stated is also mounted on the motor shaft 51, is adapted to cooperate with a cam follower 18 and to position the cam in any one of three positions. Whenthe motor is in one extreme position, the cam follower I8 engages the cam at point II. when the motor is in itsother extreme position, the cam follower I8 engages the cam 58 at point I2. When the motor is in its intermediate position,

and M, respectively.

The relay 58 comprises a relay coil 84 operatively associated with a switch blade 85. The switch blade 85 .is adapted to cooperate with a contact 88. The switch blade. 85 is normally biased out of engagement with contact 88 but is moved into engagement therewith by energize.- tion of coil 84. The switch blade 85 is shown in its energized position.

The operation of the damper motor valveI2 is controlled by a downstairs thermostat I88 and by an upstairs thermostat "I. The downstairs thermostat I88 is of a common type employing a clock to periodically change the setting thereof. Such a thermostat is shown in th'epatent to McNicoli No. 2,041,363 issued May 19, 1936. For an understanding of how such a clock thermostat is constructed reference is made to this patent. In the present drawings, such a thermostat is shown in schematic form. The thermostat proper comprises a bimetal element I82 secured to a contact arm I83. The contact arm is adapted to engage a fixed contact I84. The bimetal element is so arranged that the contact arm I83 moves to the left upon a drop in temperature. Associated with the contact arm I 83 is a'magnet I85 for imparting a differential to the thermostat. A bimetal element I82 is pivotallymountedat I88 and has secured thereto an adjusting arm I81 which adjusting arm is actuated by a clock I88. The clock I88 is adapted to also reciprocate a rod I88 connected to a pivotally mounted'mercury switch support III. The support II8 carries a mercury switch III which in the position shown is closed but whi'chu'pon being tilted in a counter-clockwisedirection is moved to open position. It is to be understood that the clock I88 is provided 1a counter-clockwise direction to open its conand the gas tacts. In the morning, the reverse actions occur- The upstairs thermostat MI is more or less conventional in form comprising a bimetallic element II5 to which is secured a contact arm IIB adapted to engage with a fixed contact 8 upon the temperature dropping to a predatormined point. A magnet H9 is associated with the arm I I8 to im art a differential to the movement of the arm. r

Operation of species of- Figure 1 The various elements. of the apparatus are shown in the position which they occupy during the normal day period. Under these circumstances, the relay 58 is maintained energized by the following circuit: from line wire (one of two line wires leading to a commercial source of power not shown), through conductors H9 and I20, mercury switch III, conductors |2I and I22, relay coil 94, and conductor I23 to the other line wire I24. The energization of relay 94 through the circuit just traced results in switch blade 95 being maintained in engagement with contact 96 as shown in the drawing. Under these circumstances, the center terminal of the motor 50 is connected to terminal 53 by the following circuit: from terminal 5| through conductor I26, switch blade 95, contact 98, conductor I21, switch blade 88, contact 89, and conductor I28 to terminal 53. Under these circumstances, the motor is in one extreme position wherein the cams 58 and 59 and the cam followers 60 and are in their full line positions. Under these conditions the dampers and 40 are also in their full line positions. With the splitter damper 25 in its full line position, the air is divided between the two ducts I5 and I1 according. to their respective duct capacities.

If the temperature of .the downstairs room. drops to the point. at which the thermostat I08 is set so as to cause engagement of contact arm I03 with contact I04, the following circuit will be established to the gas -valve I2: from linewire llii through conductor II9, bimetallic element I02, contact arm I83, contact I04, conductors I and I3I, valve I2, and conductor I32 to the other line wire I24. The establishment of this energizing circuit causes the valve I2 to open and admit gas to the gas burner, which gas burner is lighted by a pilot burner or other conventional means (not shown).

The ducts I6 and I1 are so proportioned that if the zone 22 is maintained at the proper temperature, the zone I9 is also maintained at the same temperature. The thermostat |0| in zone I9 can, accordingly, be set several degrees lower than the thermostat I00 with the assurance that the temperature in zone I9 will normally be substantially the same as that in living zone22. If for some reason or other, however, the temperature in the upstairs zone I9 should fall down to the setting of the upstairs thermostat, IM to cause engagement of contact arm H6 with contact N8, the following circuit is established to relay 55: from line wire 8 through conductors H9 and I20, switch I, conductor I2I, conductor I33. bimetallic element II5, contact arm H6, contact II8, conductor I34, relay coil 86, and conductor I to the other line wire I 24. The energization of relay coil 88 by reason of the establishment of the last named circuit. causes switch arm 88 to separate from co'ntact'SQ and to move into engagement with contact 9|. The energization of the relay also causes switch blade 81 to be moved into engagement with contact 90. The moving of switch blade 81 into engagement with contact 90 establishes the following circuit to the gas valve I2: from line wire II9 through conductor I31, switch blade 81, contact 90, conductors I38 and I3I, valve I2, and conductor I32 to the other line wire I24. This results in the energization of valve I2 so as to cause the operation of the same if the same has not previously been opened as the result of thermostat I00 calling for heat.

The moving of switch blade 88 from engagement with contact 89 and into engagement with contact 9| results in the interruption of the circuit between motor terminals 5| and 53and in the establishment of the following circuit between motor terminals 5| and 52: from terminal 5| through conductor I25, switch blade 95, contact 98, conductor I21, switch blade 88, terminal 9|, and conductor I40 to the terminal 5|. The connection of terminals 5| and 52 causes the motorto run to its other, extreme position displaced 180 from the position indicated in full lines. The cam follower .80 now engages at point 82 of the cam 58, its position being unchanged. Consequently, this movement of motordoes not afiect the position of the return air damper 40. The cam follower 10 in the new position of the motor e'ngages point 12 of the cam 59, which as previously indicated, results in the cam follower 10 assuming the upper dotted line position. .Under these conditions, the splitter damper 25 is moved to .its right dottedline position. It will be noted that in this position of the splitter damper 25, the air to duct I1 is partially,cut off and the proportional amount of air admitted to duct I6 is fill increased. This position of the splitter, damper may be referred to as the "pick -up position and is the position that the damper assumes during the pick-up period. With the damper in this position a relatively large proportion of the heated air is delivered to duct IS with the result that zone I9 receives a larger than normal proportion of the air. This increase in the proportion of the air will result in the temperature of zone I9. ouickly rising, which ouick rise is desirable in view of the fact that since thermostat ml is calling for heat. the temperature in zone I9 is at least several degrees below that of zone 22. As soon as thermostat IOI becomes satisfied,

the varions'eleinents are restored again to the position shown in the drawings.

The operation which has been described thus interrupts the only circuit to thermos at IM and cons quently takes the control of the heating plant and damper motor 50 away from this thermostat. The deenergization of relay 58 results in switch blade 95 separating from contact 96. This, in turri, results in motor terminal 5| being disconnected from both motor terminals 52 and 53.

by its internal rebalancing potentiometer which serves to run the motor to its mid position. In the mid position of the motor, the cam followers 80 and 10 engage points 83 and 13 of their respective means. The engagement of cam follower 30 with point 63 of cam 58 results in its assuming the upper dotted line position. In this position of cam follower 80,,the return air damper 40 is in its closed position as indicated in dotted The motor is now controlled solely lines. The closure of the damper .40 prevents any air from being returned from the upstairs zone to the heating plant and consequently prevents the cold air in the bedrooms from being delivered to the furnace.

The movement of cam follower 10. into engagement with the point 13 of cam 59 results in the cam follower I being moved to its lowermost dotted line position so that the splitter damper 25 is moved to its left dotted line position. It will be noted that in this position of'the splitter damper, the proportional amount of air deliv ered to the zone I9 is materially decreased. vIn this manner, it is assured that very little heated air will be delivered .to the zones in which windows may be open. At the same time, some air is delivered so that the room temperature will not drop to an excessively low value.

During the shut-down period, the thermostat I00 still retains control of the gas valve I2.

and'22 in the proportions determined by ducts I6 and I1.

Thus, whenever the temperature gets to the lower setting of thermostat I00, the gas valve is opened .to supply gas to the furnace. The result of this is that the zone 22 is maintained at the desired night temperature with a minimum expenditure of fuel. The majority or the heated air during the entire shut-down period is delivered to the zone 22' which has only the normal heat loss. A

- small amount of air is delivered to zone I9 which zone is the one with the abnormally hi h temporary heat loss. While a portion of the heated It will be noted that in the improved system of the present invention, recognition is made of the fact that the associated dwelling is normally subjected to an abnormally high heat loss during the night period. Provision is made for preventing the undue waste of heat during this night shutdown period and also for providing a quick but balanced pick-up in the temperature of the two zones in the morning. This, moreover, is accomplished with relatively simple apparatus.

Species of Figure 2 trolled by a timing mechanism so that a pick-up period of predetermined length is provided. In

. order to enable a clearer comparison of the two air is delivered to this zone, the cold air therefrom cannot enter the furnace.

When the time comes for the initiation of the pick-up period, the temperatin-e in zone I! will obviously be very far below the setting of the thermostat I0l. Consequently, when switch III is reciosed in the morning by the clock I00, the contact arm II of thermostat III will be in engagement with contact H8. This will result in the energization of both relays 55 and It. The energization of relay 50 will be eflected solely by the closure of switch III by the circuit previously traced. The energization of relay 55 will be eifected by thejoint closure of thermostat IN and switch III to eifect' the closure of the circuit traced previously. The result of the energizations of both relays 50 and i0 is that terminal 5| will now be connected to terminal 52 in the same manner as previously traced in connection with the thermostat III calling for heat during the day period. This will result in the motor 50 going to the extreme position in which cam follower 60 is in engagement with point 02 of cam '50 and follower 10 in engagement with point 12 of cam 59. Under these conditions, the damper 00 will be in the full line position wherein return air from zone I9 can again return'to the furnace. The splitter damper 25 will be moved to the right dotted line position so that the greater proportion of the air is delivered to the upstairs zone I9. The cam 50 can be so designed that the increase in proportion of air delivered to the upin this species.

figures, the various corresponding elements of the two systems have been designated by identical reference characters and will not be again described. Since the cams and the dampers operated thereby are identical with those of thepre- Ierred species, these are not shown in Figure 2. In lieu of'the relay 55 a relay I55 is employed in this species. This relay comprises a relay coil I86 which is associated with a single relay blade I88. The relay blade I88 is biased into engagement with contact I89 and is adapted to be moved into engagement with a contact I9I.

In lieu of the clock thermostat I00 of the preferred species, a clock thermostat 200 is provided The thermostat portion of the clock thermostat 200 isidentical to that of clock thermostat I00, the only change being in the switching function performed by the clock. The thermostat proper comprises a bimetal element 202 to which is secured a contact arm 203 stairs zone is adequate to cause the two zones I9 and 22 to approach the desired day temperature at approximately the same time. Before the temperature in the upstairs zone reaches the temperature which it is desired to maintain, or a temperature at which thermostat I00 is set during the day, the thermostat Ill will open interrupting the circuit to relay 5!. The Interruption ofthe circuit to relay, SI restores the various elements to the,positions shown in the drawing in full lines wherein the air is delivered to zones I0 adapted to engage with a contact 204. A magnet 205 is provided for a purpose similar to that of the magnet I05 of the preferred species. The clock in this thermostat is designated by the reference numeral200 and is adapted to actuate an adjusting arm 20'! for bimetal 202 and to reciprocate a rod 209 which is connected to a pivotal support 2I0 for a mercury switch 2. In addition to the switch 2 corresponding to switch III of the previous species, a second' Operation of species of Figure 2 The various elements of this species are shown in the position they occupy during the normal day period. It is to be.understood that the dampers and other associated apparatus are in the 'same position as they are shown in Figure 1. Under these conditions, the relay coil 50 is maintained energized by a circuit corresponding morning and opened at six.

identically to the energizing circuit therefor in the species of Figure 1, this energizing circuit being as follows: from line wire I I8 through conductors 2I9, 296, and 220, switch 2I I, conductors 22I and 222, relay coil 56, and conductor 223 to the other line wire I24. Under these conditions,

the damper motor terminals 5| and 53 are connected as follows: from terminal 5| through conductor 226, switch blade 95, contact 96, con-.

ductor 221, switch blade I88, contact I89, and

conductor 228 to the other terminal 53. Thus tact arm 203, contact 204, conductors 29'! and 298, gas valve I2, and conductor 299 to the other line wire I24. When such a circuit is established,

the gas valve is open and the gas is admitted to r the furnace in the manner previouslydescribed.

When the upstairs thermostat IOI calls for heat, a circuit is established to the gas valve as follows: from line wire II8 through conductors 2I9, 296, and 220, switch 2| I, conductors 22I and 300, bimetal element II5, contact arm II6, contact II8, conductors I and 298, gas valve I2 and conductor 299 to the other line wire I24. It

. will be noted -that, with this species, upon the thermostat IOI calling for heat, only the gas valve is energized. There is no change in the minal 5| through conductor 226, switch blade 95, contact 96, conductor 221, switch blade I88, contact I9I, and conductor 308 to the other terminal 52. A shorting of terminals 5I and 52 has the same effect as in the previous species; namely, to drive the motor 50 to the-pick-up position.

- The motor continues to remain in the pick-up position until a predetermined period of time has elapsed, at the end of which, switch 2I4 is moved to-the position shown in-the drawings wherein it is in open circuit position. Relay I55 will then be deenergized so that switch blade I88 again engages contact I89 to cause the motor to assume the normal day position. The clock can be adjusted to provide a pick-up period corresponding to the weather conditions. For example, during very cold weather a longer pickup period is necessary than in mild weather.

It will be seen that with the last named species, the splitter damper is moved to its pick-up position only during the normal pick-up period. Moreover, with the last described species, the thermostat in the sleeping zone may be set at the temperature which it is desired to maintain in the zone.

While I have described my invention in connection with a heating system, it is to be understood position of the damper motor 50 as in the preced- I deenergizes relay-56 just as in the preferred species to cause the damper motor to run to the mid position which is the shutdown position. The opening of switch 2 also interrupts the circuit to thermostat II5 so that this thermostat can no longer open the valve I2. It will be noted that the action upon shut-down is exactly the same .as in the species of Figure 1.

In other words, control is taken away from the upstairs thermostat and the'amount of air delivered to the upstairs zone is decreased.

Upon the time arriving for the morning pickup period the clock 208 in this species is effectivev to notonly reclose switch 2 but also to close switch. 2M. The closure of switch 2H reenergizes relay coil-56 and restores control-of the.

thermostat M0 over the gas valve I2. The clock also functions to again raise the setting of the thermostat 200 so that this thermostat will call for heat. As in the previously described species, it is necessary that relay I55 be energized for the pick-up period. In the previously described species, this energization of relay I55 was accomplished through the closure of thermostatic switch I M. In the present species, this energization of relay I55 is accomplished by the closure of switch 2I4. Upon closure of this switch, the following circuit is established to relay I55: from line wire II8 through conductors 2I9 and 805,

I switch 2I4, conductor 306, relay coil I86, and conductor 301 to the other line wir I24. The energization of relay coil- I86, as a result of the establishment of this circuit, causes switch blade I88 to move into engagement with contact 'I9I, cs-

that the same is applicable to any air conditioning system wherein it is desired to maintain th1s value of a. condition in one of the zonesduring a certain predetermined period. While I have disclosed adamper in the return air duct leading from the zone occupied at night,'it is to be understood that if desired the return duct from this zone may be entirely omitted, in which case there obviously would be no need for such a damper. In general, while I have shown and described the invention in considerable detail, it is' to be understood that this is only for purposes of illustration and that the scope of the invention is limited only by the scope of the appended claims.

I claim as my invention:

1. In an air conditioning system for an enclountil the condition in said zone attains a prededetermined value.

2.'l'.n an air conditioning system, air conditioning means, means for conveying the conditioned air to a plurality of zones, means for proportioning the air delivered to said zones, condition responsive means in one of saidzones normally controlling said air conditioning means, means for causing said proportioning means to reduce the amount of air delivered to one of said zones for a predetermined period of time and to interrupt the control of said air conditioning means by said condition responsive means during said period, and means including said condi-' tion responsive means operative upon the termination of said period to cause said proportioning means to deliver to said on zone a greater than normal portion of said air until the condition in said zone has attained the value for which said condition responsive means is set to maintain.

tablishing the following circuit: from motor ter- 1 3. In an air conditioning system, for an en- I tioning means; means for conveying the condiclosure having a plurality o1 zones air conditioning means, means-normally 'efiective to distribute the conditioned air among said zones in predetermined proportions, condition responsive means in one ofsaid zones normally controlling 5 said air conditioning means, means for causing said proportioning means to reduce the amount of air delivered to said one zone for a predetermined period of time and to interrupt th control of said air conditioning means by said condition responsive means during said period, and means operative upon the termination of said period to cause said distributing means to deliver a to said one zone a greater than normal portion of saidair for a second predetermined period of time. 4. In a warm air heating system for a residence having a first zone consisting of rooms primarily occupied for sleeping purposes and a second zone consisting of rooms primarily 00- g cupied during the day, means for heating th air, means for normally distributing the heated air between said zones in predetermined proportions, means for reducing the delivery of air to the first zone during the period the same is used for sleeping purposes, and means operative after the termination of said period to supply a greater than normal portion or air to said first 'zone while reducing theflow or air to said second zone.'

5.In an air conditioning system for an enclosure having a plurality of zones; air conditioned air to said plurality of zones; means tor proportioning the air delivered to said zones; 5 condition responsive means in all or said zones, each normally controlling said air conditioningmeans; and means to interrupt the control or said air conditioning means by the condition responsive means mail but one or said zones during a predetermined period, to charge the setting of the condition responsive means in said one zon so as to cause the same to maintain during said period a new value of the condition requiring less operation or the conditioning means, and to cause saidproportioning means to increase the proportionate amount or the air Y delivered to said one zone during said period.

1 6. In an air conditioning system for an enclosure having a plurality of zones; air conditioning means; means iorconveying the conditioned air to said plurality of zones; means for proportioning the air delivered tosaid zones; condition 'responsive means in all or said zones, each normally controlling said air conditioning means;

and means to interrupt the control of said air conditioning means by the condition responsive means in all but one of said zones during a predetermined period, to change the setting of the .condition responsive means in said one zone so as to cause,the sameto maintain during said period a new value of the condition requiring less operation of the conditioning means, and to cause said proportioning means to increase the proportionate amount of the air delivered to said one zone during said period} said means being operative at the expiration of said period to restore the control or said air oonditioningmeans to all of said condition responsive means, to restore the setting or said condition re p means in said one zone, and to cause said proportioning means to temporarily decrease the proportionate amount or air delivered to said one zone.

-'7. In an air conditioning system for an encio- 7s the condition is maintained in both of the zones, 4 condition responsive means in each of the zones controlling the operation of the air conditioning means, the condition responsive means in one of said zones being set to maintain the desired value of the conditionand the condition responsive means in the other zone being set to maintain a value of the condition requiring less operation of the condition changing means, and means operative when said last named condition responsive means calls for conditioning to supply a greater than normal portion of the conditioned air to said other zone.

8. In an air conditioning system for an en closure comprising two zones, air conditioning means, means for'conveying the conditioned air to said zones, said means normally being opera-, tive to divide the conditioned air between the zones in such a manner that the same value of the condition is maintained in both of the zones, condition resp nsive means in each of the zones controlling the operation or the air conditioning means, th condition responsive means-in one of said zones being set to maintain the desired value of the condition and the condition responsive means in the other zone being set to maintain a value or the condition requiring less operation of thecondition changing means, means operative when said last named condition respon'sive means calls for conditioning to supply a greater than normal portion of the conditioned air to said other zone, and further means operative during a predetermined period to render ineffective said last named condition responsive means and to cause said air conveying means to convey a less than normal portion or the conditioned airto said other zone.

9. In a heating system for an enclosure having a plurality of zones one of which has an abnormally' high heat loss during certain periods, fluid heating means, thermostatic, means in a diflerent one of said zones for normally controlling said fluid heating means, means for normally distributing the heated fluid among said zones in predetermined proportions, means for decreasing the flow oi fluid to the rest of the enclosure for a predetermined time following such a period of abnormally high heat loss in said one zone whereby a, greater than normal portion of the total fluid is conveyed to said one zone, and means for causing continuous operation of said fluid heating means independently of said thermostatic means during the time in which the flow of heated fluid to the other zones is reduced.

10. In a heating system for an enclosure having a plurality of zones one of which has an abnormally high heat loss during certain periods, fluid heating means, a thermostatic means in a diflerent one of said zones for normally controlling said fluid heating means, means for normally distributing conveying the heated fluid "among said plurality of zones in predetermined proportions, and means operative for a predeterminedperiod of time following such a period of abnormally high heat loss in said zone to decrease the flow o1 fluid to the rest of the enclosure and thereby increase the portion of the fluid going to said one zone.

11. In a warm air heating system tor a realdence havinga first zone consisting of rooms means for heating air, means for delivering the heated air to the respective enclosed spaces, a temperature responsive device located in one of said spaces, means responsive to the operation of said device for controlling the operation of said heating means, a time switch located in a second space, and means responsive to the operation of said time switch for impeding the flow of heated air to the spaces other than that in which said time switch is located.

13. In a system of the character described, means defining a plurality of enclosed spaces, means for heating air, means for delivering the heated air to the respective enclosed spaces, a temperature responsive device located in one of said spaces, means responsive to the operation of said device for controlling the operation of said heating means, a time switch located in a second space, and means responsive to the operation of said time switch for impeding the flow of heated air to the spaces other than that in which said time switch is located and for impeding the return of medium from which heat has been extracted from the spaces other than that in which said time switch is located.

14. In a system of the character described,

means defining a plurality of enclosed spaces,

means for conditioning air, means for delivering the conditioned air to the respective enclosed spaces, condition responsive means located in one of said spaces, means operable by said condition responsive means for controlling the operation of said air conditioning means, time-controlled means, and means operable by said time-controlled means to reduce the amount of air delivered to said one space for a predetermined period of time and to interrupt control of said air conditioning means by said condition responsive means during said period, said last-named means being operative at the expiration of said predetermined period to increase temporarily the amount of air delivered to said one space.

15. In an air conditioning systenrfor a building having a plurality of zones, air conditioning means, means for normally distributing the supply of conditioned air among said zones in proportions determined in accordance with the relative demands of said zones so as to maintain a condition of the air in each zone at a predetermined value, means for decreasing for a predetermined time the proportion of air delivered to' one of said zones without regard to the demand therein, and means operative at the expiration of said predetermined time for increasing temporarily the proportion of air delivered to said one zone so as to'accele'rate restoration of said condition in said one zone to said predetermined value.

16. In a heating system for a building having a plurality of zones, fluid heating means, means for distributing the supply of heated fluid among said zones in proportion to their respective normal heat losses so as to maintain each of said zones at a predetermined temperature, one of said zones being subject to periods of abnormally high heat loss during which the temperature in said one zone falls below said predetermined temperature, and means operable at the expiration of one of said periods of abnormally high heat loss to increase temporarily the proportion of fluid distributed to said one zone so as to accelerate the return of said one zone to said predetermined temperature.

17. In a heating system for a building having a plurality of zones, fluid heating means, means for distributing the supply of heated fluid among said zones in proportion to their respective normal heat losses so as to maintain each of said zones at a predetermined temperature, one of said zones being subject to periods of abnormally high heat loss during which the temperature in said one zone falls below said predetermined temperature, and means operable at the expiration of one of said periods of abnormally high .heat loss to increase the proportion of fluid distributed to said one zone until said one zone ,regains its predetermined temperature.

SAMUEL S. LAWLER.

CERTIFICATE OF- CORRECTION.

vPatent No. 2,2905757. Y July 21, 19 2.

SAMUEL s. LAWLER It is hereby certified that error appears in the printed specification of the above numbered-patent requiring correction as follows: Page 6, secyond'column, line 66, claim 10, strike out "conveying' i; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. Signed and sealed this 12th day of January, A. D. 1911.5.

Henry Van 'Arsdale, (8681) Acting Commissioner of Patents. 

